JP3907983B2 - Turbo fan for air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner, and more particularly to an improvement in the structure of a turbo fan for an air conditioner.
[0002]
[Prior art]
FIG. 1 is an exploded perspective view showing a conventional door-type air conditioner. The conventional door-type air conditioner will be described with reference to FIG.
A front grill 3 is attached to the front surface (in the indoor side direction) of a base pan 1 that forms the bottom of the air conditioner. A suction portion 3i of a passage through which room air flows is formed below the front grill 3, and a discharge grill 3e is formed on the upper side, where the air heat-exchanged inside the air conditioner is further discharged into the room. The
A suction grill (not shown) is attached to the suction part 3i, and a filter is attached between the suction grill and the suction part 3i.
[0003]
An air guide 7 is located inside the front grill 3, and an indoor heat exchanger 5 is attached to the air guide 7. The indoor heat exchanger 5 serves to cool the air sucked through the suction portion 3i by heat exchange between the working fluids of the air conditioning cycle.
[0004]
The air guide 7 is attached to the upper surface of the base fan 1 and serves to partition the interior of the air conditioner into an indoor side and an outdoor side. That is, the indoor side and the outdoor side are blocked by the air guide 7, and the air flow between them is blocked.
The air guide 7 is formed with a shaft hole 7 が through which the rotation shaft of the motor 15 for rotating the sirocco fan passes so that the indoor side and the outdoor side are communicated. Further, a pair of braces 7B for fastening with the blower fan shroud 18 are formed at the upper end of the air guide 7.
Further, a control box seating portion 8 in which the control box is accommodated is integrally formed on one side of the air guide 7.
[0005]
A scroll 9 is attached inside the air guide 7. Inside the scroll, a flow guide surface 9a is formed on one side so as to have a predetermined curvature on the other side.
Also, an Olipis 11 is attached to the entire surface of the scroll 9, and an Olipis hole 12 for guiding the air flowing through the outdoor heat exchanger 5 to the sirocco fan 13 is formed in the Olipis 11. A pair of discharge guides 11e for guiding the air heat-exchanged by the discharge grill 3e is formed at the upper end of the Olipis 11.
The middle part of the rear end of the discharge grill 11e is opened, and a fastening part 11 ｀ that is fastened to the upper end of the air guide 7 is formed in the opened part. A finger guide F is formed at the rear end of the discharge guide 11e so as to block the sirocco fan 13 from the outside. Further, a projection E that serves to prevent the white scroll 9 from being seen from the outside is formed on one side, and the projection E is made of ESP Styrofoam.
[0006]
As described above, since the discharge guide 11e is formed on the upper part of the Olipis 11, the Olipis 11 is inserted between the indoor heat exchanger 5 and the sirocco fan 13 from the upper part to the lower part. That is, the Olipis 11 is assembled in a top-down manner.
[0007]
A sirocco fan 13 is attached to the inside of the scroll 9 so that indoor air flows through the suction portion 3 i, the indoor heat exchanger 5, and the orifice hole 12. The sirocco fan 13 sucks air through the orifice hole 12 and causes the air to flow in the circumferential direction, so that the air flowing in the circumferential direction is guided along the flow guide surface 9g and It flows into the discharge guide 11e.
[0008]
The part described so far is the indoor side of the window-type air conditioner, and the configuration of the outdoor side will be described as follows.
A motor 15 for rotating the sirocco fan 13 and the blower fan 17 is attached to the outdoor side (rear side) of the air guide 7. The motor 15 has a rotating shaft protruding forward and backward, and one of the rotating shafts passes through the air guide 7 and protrudes to the center of the scroll 9 to be coupled to the sirocco funnel 13.
A blower fan 17 is coupled to the outdoor rotary shaft of the motor 15. The blower fan 17 plays a role of sucking air outside the air conditioner and passing it through the outdoor heat exchanger 19 to exchange heat. Such a blower fan 17 is provided with a ring 17r for connecting the ends of the blades.
[0009]
Next, the base fan 1 is provided with a shroud 18 that guides the airflow formed by the blower fan 17. The blower fan 17 is positioned on the shroud 18 for the blower fan and communicates with the outdoor heat exchanger 19 side. A through hole 18 ｀ is formed.
An outdoor heat exchanger 19 is attached to the outdoor side of the base fan 1 that matches the shroud 18 for the blower fan. Although not shown, a compressor and an expansion valve that are components of the air-conditioning cycle are attached to the outdoor side.
[0010]
Finally, the outer case 20 is shielded from the various parts forming the air conditioner as described above. Such an outer case 20 constitutes the appearance of an air conditioner.
The window-type air conditioner having such a configuration is installed and used such that a portion corresponding to the indoor side is in a space for air conditioning and a portion corresponding to the outdoor side is outside.
[0011]
Hereinafter, the operation of the air conditioner will be described.
When the air conditioner is driven, the air conditioner cycle is operated, and the motor 15 rotates the sirocco fan 13 and the blower fan 17.
Therefore, indoor air is transmitted to the indoor heat exchanger 5 through the suction part 3i.
The air exchanges heat with the working fluid while passing through the indoor heat exchanger 5, and becomes a relatively low temperature. Further, the heat-exchanged air is transmitted to the sirocco fan 13 through the orifice hole 12.
The air sucked into the sirocco fan 13 is guided and discharged in the circumferential direction of the sirocco fan 13, and the discharged air is guided along the flow guide surface 9g of the scroll 9 and transmitted to the discharge guide 11e. . Thus, the low temperature air transmitted to the discharge guide 11e is discharged to the air conditioning space via the discharge grill 3e.
[0012]
In addition, the operation | movement which discharges | emits the heat which the working fluid was transmitted with the indoor heat exchanger 5 outside is performed in the outdoor side. That is, external air is sucked in by the blower fan 17, and the sucked air exchanges heat with the working fluid while passing through the outdoor heat exchanger 19, and releases heat to the outside.
[0013]
However, the conventional window type air conditioner has the following problems.
First, a sirocco fan 13 is used in a conventional window type air conditioner to suck indoor air. The sirocco fan is designed for high airflow and has a number of short blades having a curvature opposite to the rotational direction, so that there is only another air guide structure called a scroll 9 and an air flow is formed. . Therefore, the scroll 9 should always be used, and various problems are caused by the use of the scroll.
[0014]
If it demonstrates in detail, air will be discharged in the circumferential direction in the sirocco fan 13, and air will be discharged with respect to the whole flow guide surface 9g. Accordingly, the air discharged to the upstream portion of the flow guide surface 9g continues to flow along the flow guide surface 9g, but the wind pressure increases toward the downstream portion and acts as a resistance element against the rotation of the sirocco fan 13. To do.
Further, since air is intensively guided to the downstream part of the flow guide surface 9g, the air is biased toward one side of the discharge guide 11e. That is, when viewed from the entire discharge grill 3e, air is not discharged uniformly.
[0015]
Therefore, in order to solve the disadvantages of the sirocco fan designed for high output, there has been proposed a technique for creating a flow of air inside the room using a highly efficient turbo fan.
An example of a conventional turbofan will be described with reference to FIGS. 2, 3a and 3b.
[0016]
First, the turbofan is a disk type, and a base plate 32 provided with a hub 38 for connection with a rotating shaft of a motor at the center, and a large number of turbofans are attached to the edge of the base plate 32 along the circumferential direction. The blade 34 and a shroud 36 formed in a pair on the blade 34 are configured.
At this time, the blade 34 of the turbofan has a blade exit angle β2 smaller than 90 degrees. Further, the inner / outer diameter ratio d1 / d2 is smaller than 0.8 and has a configuration in which it is bent backward (bag round curve) with respect to the rotation direction. Further, the blade 34 is formed such that the inlet width w1 at which air starts to guide is larger than the outlet width W2.
[0017]
Further, the shroud 36 is formed in an annular shape so as to connect all the blades 34, and is connected to the blade 34 particularly along the side where the width of the blade 34 becomes narrower. Such a shroud 36 serves to guide the flow of air flowing along the blades 34 so that air passing between adjacent blades 34 is discharged as a predetermined wind pressure.
[0018]
In the blade 34, the blade inlet angle β1 on the hub 38 side and the blade outlet angle β2 on the shroud side can be formed differently. In this way, the flow between the blades 34 is made uniform and the noise characteristics are further improved.
[0019]
In addition, when using a turbo fan as above-mentioned, since the flow guide surface which guides air separately is not required on ventilation characteristics, the scroll 9 of FIG. 1 can be omitted, and the whole structure of an air conditioner There is an advantage that can be simplified.
[0020]
Next, the manufacturing process of the conventional turbofan will be described.
The base plate 32 and the blade 34 are integrally formed by injection molding as a synthetic resin material, and the shroud 36 and the synthetic resin material are made by injection molding separately from the base plate and the blade.
[0021]
The shroud 36 is coupled to the upper portion of the blade 34 by heat fusion using ultrasonic waves.
However, there are the following disadvantages of the conventional turbofan having the above structure.
First, the conventional turbofan has a structure in which the shroud 36, the base plate 32 and the blade 34 cannot be integrally molded.
Therefore, in the conventional turbofan, the shroud 36 separately formed is joined to the upper part of the blade 34 which is injection-molded integrally with the base plate 32 by the ultrasonic fusion method or the like. In this case, the fusion position between the two members is accurately determined. There is a disadvantage that the defect rate becomes high because it is difficult to match.
[0022]
That is, the positional relationship between the twins to be fused should be set accurately before the fusion process is performed, as well as the positional deviation of the twins and the distortion of the blade 34 caused by the vibration actually generated from the fusion process. Therefore, it is not easy to eliminate defects in the manufacturing process.
In addition, the conventional turbofan has a cost burden that it should be equipped with another expensive equipment such as an ultrasonic fusion machine for manufacturing, that is, the manufacturing cost of the turbofan increases. It was.
[0023]
As shown in FIG. 3b, the conventional turbofan has a size in which the outlet width W2 of the blade 34 is smaller than the inlet width W1. This means that the flow area ratio of the air discharged by the blade 34 is different between the inlet side and the outlet side of the blade 34.
That is, it means that the air discharge space is gradually narrowed from the inlet side to the outlet side of the blade 34.
[0024]
Therefore, according to such a turbofan, the air flow area ratio on the inlet / outlet side of the blade 34 is different, the pressure ratio formed by the flowing air is also different from each other, and the pressure balance is not matched, and the flow noise is reduced. There is a disadvantage that it occurs.
FIG. 4 shows a turbofan structure in which the shroud 36, which is one of the problems of the turbofan having the above-described structure, overcomes the structural limitation in which the base plate 32 and the blade 34 cannot be integrally formed by injection molding.
[0025]
This will be described with reference to FIG.
According to the turbofan structure shown in FIG. 4, the boss 41 coupled to the rotating shaft (not shown) of the motor is formed at the center of the base plate 42, and the boss 41 is formed along the edge of the base plate 42. A large number of blades 43 are formed radially in the center.
A shroud 44 is provided on the opposite side of the blade 43 from the base plate 42. The inner diameter D1 of the shroud 44 is the same as or larger than the outer diameter D2 of the base plate 42, and the suction side end 44a of the shroud 44 is formed in parallel to the axial direction.
[0026]
The reason for this is that, as shown in FIG. 5, when the upper and lower molds A and B are separated along the parting line G, the boss 41 is prevented from causing interference between the molds. This is because the base plate 42, the blade 43, and the shroud 44 are integrally formed at a time.
[0027]
The shroud 44 is curved outward from the suction side end portion 44a toward the outlet side of the blade 43, thereby forming a curved portion 44b as shown in FIG.
A predetermined amount of an end 44c is formed in the radial direction on the inner peripheral surface of the suction side end 44a, and the inner peripheral surface of the curve 44b is connected to the radial end of the end 44c.
[0028]
The conventional turbofan configured as described above has the following problems.
First, the length of the end 44c formed in the radial direction on the inner peripheral surface of the suction side end 44a is only smaller than the radial thickness (t) of the shroud 44.
[0029]
In addition, when the thickness of the turbofan is formed so as to exceed a certain thickness (for example, 4 mm), the material cost increases, and a problem such as a reduction in quality due to a shrinkage phenomenon at the time of forming occurs. Therefore, there is no choice but to make it below a certain thickness.
Therefore, for example, when the thickness of the turbofan is 4 mm, the length (β) of the stepped portion 44c is only about 1 mm to 2 mm.
[0030]
In this way, the length of the step portion 44c is only smaller than the thickness of the turbofan, but the molding is not performed well at the initial stage, but the lower mold portion that hits the step portion 44c when the mold is used for a long time is not provided. Since it becomes worn and has a sharp edge, there is a problem that a burr is generated in the step 44c of the turbofan after completion of molding.
[0031]
That is, since the mold-like portion that contacts the step 44c of the turbofan is easily worn, the durability of the mold is reduced.
In addition, since the length of the stepped portion 44c is smaller than the radial thickness of the shroud 44, there is a disadvantage that it is not easy to manufacture a mold.
As shown in FIG. 6, the conventional turbofan having the above-described configuration exhibits unstable flow characteristics due to the generation of vortex from the outside of the curved shroud 44.
Therefore, the difference in the discharge flow velocity due to the shape of the shroud 44 affects the air flow and the warm flow rate inside the casing 21 and is connected to noise.
[0032]
[Problems to be solved by the invention]
The present invention is for solving the above-mentioned problems of the prior art, and it is possible to integrally mold a turbo fan, and it is easy to manufacture a mold for molding the turbo fan, and the durability of the mold is improved. It is an object to provide a turbofan for an air conditioner having a new structure.
It is another object of the present invention to provide a turbo fan for an air conditioner in which noise generated during driving is minimized.
[0033]
[Means for Solving the Problems]
In order to achieve the above object, a first embodiment of the present invention includes: a base plate provided with a hub coupled to a rotation shaft of a drive motor at a central portion; and arranged in a circumferential direction on a peripheral edge of the base plate. A plurality of blades; a suction side end coupled to an end of the blade and formed in a direction parallel to the rotation axis, and having an inner diameter equal to or larger than an outer diameter of the base plate; A linear portion formed by linearly extending outward in the radial direction from the inner peripheral surface of the suction side end portion; and an inclined step portion extending obliquely in the centrifugal direction of the base plate at the end portion of the linear portion; A shroud.
[0034]
The base plate is formed in a cap shape so that the central portion where the hub is formed is located closer to the inlet side than the base portion outside the hub, and connects the central portion where the hub is formed and the base portion. A large number of through holes are formed in the connecting portion along the circumferential direction.
[0035]
The connecting portion is parallel to the rotation axis direction, and a portion where the central portion where the hub is formed and the connecting portion is joined is curved.
[0036]
The width of the straight portion of the shroud is at least 4 mm.
[0037]
According to the first embodiment of the present invention, noise can be relatively reduced as compared with other types of turbofans in which the air flow through the turbofan is smoothly performed and the airflow is the same. Can be easily manufactured and the occurrence of wear can be suppressed, so that the durability of the mold can be improved.
[0038]
Moreover, it is possible to integrally mold the entire turbofan by a single injection molding.
[0039]
According to a second embodiment of the present invention for achieving the above object, a base plate provided with a hub coupled to a rotation shaft of a drive motor at a central portion, and an outer peripheral edge of the base plate in a circumferential direction. There is provided a turbofan for an air conditioner, comprising: a plurality of blades arranged along; and a shroud coupled to an end of the blade.
[0040]
At this time, the outer peripheral edge of the base plate connected to the inner surface of the blade is connected to the blade while being bent forward or rearward of the turbofan.
[0041]
In particular, it is preferable that the outer peripheral edge of the base plate be bent at 90 degrees forward or rearward of the turbofan.
[0042]
Further, it is preferable that an inner side surface of the blade that fits the shroud is formed so as to be positioned closer to the center side of the turbofan than the inner peripheral surface of the front end of the shroud.
[0043]
According to the second embodiment of the present invention, since the portion where the shroud and the base plate overlap each other is eliminated, the entire turbofan can be integrally formed by a single injection molding, and the outer peripheral edge of the base plate and the inner surface of the blade are mutually connected. The width of the connecting portion to be connected can be sufficiently secured.
Further, since the entire turbofan can be integrally formed by injection molding, the mold can be easily manufactured and the occurrence of wear can be suppressed, so that the effect of improving the durability of the mold can be obtained.
[0044]
According to a third embodiment of the present invention for achieving the above object, a base plate provided with a hub coupled to a rotation shaft of a drive motor at a central portion of the drive center, and a peripheral portion of the base plate. An air conditioner comprising: a plurality of blades arranged at regular intervals along a circumferential direction and having a size having the same inlet width and outlet width; and a shroud coupled to an end of the blade. A turbofan for aircraft is provided.
[0045]
At this time, the shroud includes a connecting portion that interconnects the end faces of the blades 34 on the front side of the turbofan, and a protruding portion that extends from the inner end of the connecting portion to the front side of the turbofan so as to be orthogonal to the connecting portion.
[0046]
The connecting portion of the shroud can be connected over the entire blade tip, or can be connected to only a part of the blade tip.
[0047]
According to the third embodiment of the present invention for achieving the above object, since the same wind pressure is applied from the inlet to the outlet of the rotating blade, the pressure balance is achieved and the air flow noise is suppressed to the maximum. Is done.
In addition, the entire turbofan can be integrally molded by a single injection molding, and the mold can be easily manufactured and the occurrence of wear can be suppressed, so that the effect of improving the durability of the mold can be obtained.
[0048]
According to the fourth embodiment of the present invention for achieving the above object, a hub that protrudes in two steps on the front side toward the shroud and is coupled to the rotating shaft of the drive motor is provided at the center of the protrusion. A base plate, a plurality of blades arranged at regular intervals in the circumferential direction on the periphery of the base plate and having the same inlet side width and outlet side width, and a shroud coupled to the ends of the blades A turbo fan for an air conditioner is provided.
[0049]
According to the fourth embodiment of the present invention, the axial width of the turbo fan and the motor can be reduced. Therefore, the space for arranging the peripheral components can be secured wider, and the arrangement and design of the peripheral components can be made more free. There are advantages to doing so.
[0050]
In addition, the entire turbofan can be integrally molded by a single injection molding, and the mold can be easily manufactured and the occurrence of wear can be suppressed, so that the effect of improving the durability of the mold can be obtained.
[0051]
Note that the cross-sectional shape of the blade 34 applied to the turbofan according to the first to fourth embodiments of the present invention has a streamlined cross section or a simple flat cross section.
[0052]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
First, a first embodiment of the present invention will be described with reference to FIGS. 7 is a perspective view showing the turbofan according to the first embodiment of the present invention, FIG. 8 is a cross-sectional view of FIG. 7, FIG. 9 is an enlarged view of the main part of FIG. 7, and FIG. It is sectional drawing which shows the air flow at the time of the turbo fan application by 1st Embodiment.
[0053]
The turbo fan for an air conditioner according to the first embodiment of the present invention includes a base plate 30 provided with a hub 32 coupled to a rotating shaft of a drive motor at a central portion; And a plurality of blades 40 arranged at regular intervals along the edge of the blade 40, and joined to the ends of the blades 40 and formed in a direction parallel to the rotation axis, and the inner diameter D1 thereof is the same as the outer diameter D2 of the base plate. At the suction side end portion 52 that is formed or large, the straight portion 54 that is formed by linearly extending outward from the inner peripheral surface of the suction side end portion 52 in the radial direction, and the end portion of the straight portion 54 A shroud 50 serving as an inclined step portion 56 that extends obliquely in the centrifugal direction of the base plate 30.
[0054]
The base plate 30 is formed in a cap shape so that the central portion where the hub 32 is formed is located closer to the suction port than the base portion 31 outside thereof, and maintains the balance of the turbofan. A plurality of through holes 38 are formed along the circumferential direction in the connecting portion 36 that connects the center portion and the base portion 31 in order to smoothly release heat generated from the motor.
[0055]
It is desirable that the connecting portion 36 be parallel to the rotation axis direction, and a portion where the central portion where the hub 32 is formed and the connecting portion 36 meet is curved.
[0056]
The width of the straight portion 54 of the shroud 50 is preferably at least 4 mm.
[0057]
Hereinafter, a mold structure for manufacturing a turbofan according to a first embodiment of the present invention and an operation of the turbofan formed through the mold structure will be described.
First, in the turbofan of the present invention, the base plate 30, the blade 40, and the shroud 50 are integrally formed. The most problematic part from the molds A and B for forming the turbofan having such a configuration is the shroud 50 part.
[0058]
Accordingly, as shown in FIG. 9, the upper mold A is attached so as to be pulled out through the inner diameter surface of the suction side end 52 of the shroud 50 after the turbofan is formed, and the lower mold B is formed of the turbofan. Thereafter, the base plate 30 is attached so as to come out below the linear portion 54 and the inclined step portion 56 along the outer diameter of the base plate 30.
That is, the parting line of the mold coincides with the outer diameter D2 of the base plate 30 or coincides with the inner peripheral surface of the suction side end portion 52 having a larger diameter.
[0059]
According to such an embodiment of the present invention, since the portion where the shroud 50 and the base plate 30 overlap each other is eliminated, the entire turbofan can be integrally formed by a single injection molding.
Therefore, it is possible to minimize the defect rate that occurs during the molding of the turbofan and to expect the effect of improving productivity.
[0060]
In addition, the hub 32 of the base plate 30 serves to maintain the balance of the turbofan by being positioned in the axial and radial center, and the weight center becomes uniform, so that the mold can be removed when the turbofan is molded. The distortion of the turbo fan can be prevented by being made stable. At the same time, the hub 32 located in the central part in the axial direction and the radial direction is connected to the motor so as to maintain a balance so that the turbo fan rotates accurately without being biased during rotation, and also serves to reduce vibration and noise. Yes.
[0061]
The shroud 50 includes a suction side end 52 parallel to the rotation axis direction, a straight part 54 extending outwardly from the suction side end 52 in parallel to the base plate 30, and a tip of the straight part 54 to the base plate 30. It comprises an inclined step portion 56 formed obliquely extending outward.
That is, the straight portion 54 has an annular shape by having a predetermined length δ outside the suction side end portion 52, whereby a diameter D4 formed by a line connecting the straight portion ends is at least the suction side end portion of the shroud 50. Of course, it becomes larger than the outer diameter D3 of 52.
[0062]
With such a geometric feature, the turbofan according to the first embodiment of the present invention exhibits flow characteristics as shown in FIG. 10 and noise is reduced. That is, noise due to warm current generated from the shroud 50 is reduced. FIG. 10 shows an LDV experiment conducted to visualize the flow characteristics of the turbofan according to the present embodiment, and shows the magnitude of the warm flow rate generated from the shroud 50 of the turbofan and the characteristics of the discharge flow.
[0063]
That is, in the turbofan according to the first embodiment of the present invention, air flow characteristics are excellent, and no vortex is formed on the discharge side as shown in FIG.
Therefore, compared with the conventional case, when the air volume is the same, an effect of relatively reducing the noise of the turbo fan can be obtained.
[0064]
In addition, since the length of the linear portion 54 is increased and the portion of the lower mold B that contacts the linear portion 54 and the width of the lower mold B are increased, the molds A and B can be manufactured more easily than before. Generation can be suppressed to the maximum, and durability or improvement can be achieved.
That is, according to the first embodiment of the present invention, the noise can be relatively reduced with the same air volume, the mold can be easily manufactured, the wear can be suppressed, and the durability of the mold can be improved. can get.
[0065]
Next, the turbo fan according to the second embodiment will be described with reference to FIG. FIG. 11 shows a turbo fan according to a second embodiment of the present invention, in which a base plate 50 provided with a hub 52 coupled to a rotation shaft of a drive motor at the center and a peripheral edge of the base plate along the circumferential direction. A plurality of blades 60 arranged at regular intervals; and a shroud 70 coupled to an end of the blade 60.
[0066]
At this time, the outer peripheral edge of the base plate 50 connected to the inner surface of each blade 60 is connected to the blade 60 in a state of being bent rearward of the turbo fan on which the motor is installed.
In particular, the outer peripheral edge 54 of the base plate 50 is preferably bent at 90 degrees toward the rear side of the turbofan.
Further, the inner side surface 62 of the blade 60 that fits the shroud 70 is formed so as to be located closer to the axial center of gravity side of the turbofan than the inner peripheral surface of the front tip 72 of the shroud 70.
[0067]
As described above, according to the second embodiment of the present invention, the diameter D2 of the inner peripheral surface of the front tip 72 of the shroud 70 is larger than the diameter D1 formed by the inner surface 62 of the blade 60, and the shroud 70 and the base plate 50 are formed. Since there are no overlapping portions, the entire turbofan can be integrally molded by a single injection molding.
Therefore, it is possible to expect the effect that the defective rate generated at the time of forming the turbofan can be minimized and the productivity can be improved.
[0068]
Note that the second embodiment of the present invention is also easy to manufacture and can suppress the occurrence of wear, and the effects of improving the durability of the mold can be obtained.
[0069]
At the same time, the diameter D2 of the inner peripheral surface of the front tip 72 of the shroud 70 is larger than the diameter D1 formed by the inner surface 62 of the blade 60, so that a sufficient amount of air can be secured.
[0070]
That is, the diameter D2 formed by the inner peripheral surface of the front tip 72 of the shroud 70 having a function as a suction port for sucking air in the turbofan is substantially larger than the diameter D1 formed by the inner surface 62 of the blade 60. The mouth becomes wide and the air intake amount can be increased.
[0071]
The shroud 70 according to the present embodiment can be fused and fixed to the blade 60 or can be fixed using another fixing member.
[0072]
As described above, according to the second embodiment of the present invention, the basic technical essence is that a plurality of blades 60 are connected to the outer peripheral edge 54 of the base plate 50.
[0073]
In the illustrated embodiment, the outer peripheral edge 54 of the base plate 50 is connected to the inner side surface 62 of the blade 60 in a form bent toward the rear of the turbofan.
[0074]
However, since the basic technical idea is to connect the inner surface of the blade 60 to the outer peripheral edge of the base plate 50, it is of course not limited to the form shown in FIG.
For example, unlike the one shown in FIG. 11, the outer peripheral edge of the base plate 50 is molded in a state bent to the front side of the turbo fan in the opposite direction, and is connected to the inner side surface 62 of the blade 60. You can also.
[0075]
As described above, according to the configuration in which the outer peripheral edge 54 of the base plate 50 is connected to the inner side surface 62 of the blade 60 while being bent forward or rearward, the base plate outer peripheral edge 54 and the blade A sufficient width of the connecting portion where the inner side surfaces of 60 are connected to each other can be secured.
However, unlike the above, it is also possible to form the base plate 50 in a flat state without bending the outer peripheral edge 54 and to connect the outer peripheral edge and the inner side surface 62 of the blade 60 in this state.
[0076]
In such a case, it is desirable that the lower end surface 64 of the blade 60 and the bottom surface of the base plate 50 are located on the same plane.
At the same time, in the case of the present embodiment, as in the first embodiment, the hub 52 that maintains the balance of the weight center of the turbofan is positioned close to the center of the turbofan along the axial direction. Die release is good, and vibration and noise due to eccentricity when the turbo fan is driven can be reduced.
[0077]
Next, a turbo fan according to a third embodiment will be described with reference to FIG.
FIG. 12 is a cross-sectional view illustrating a turbofan structure according to a third embodiment of the present invention. The turbofan according to the third embodiment of the present invention includes a hub coupled to a rotating shaft of a drive motor at a central portion. A plurality of blades 60 having the same inlet width and outlet width are disposed on the peripheral edge of the base plate 50 along the circumferential direction and spaced apart from each other, and a shroud 70 coupled to the end of the blade 60.
[0078]
Thus, by forming the inlet width and the outlet width of the blade 60 with the same size, the contact area ratio between the blade 60 and the air when the air is substantially discharged from the central portion of the turbofan in the outer circumferential direction. Is the same from the entrance side of the blade 60 to the exit.
[0079]
Further, the shroud 70 coupled to the front end portion of the turbo fan of each blade 60 is connected to the front end surface of the front side of the turbo fan of each blade 60 and is orthogonal to the connection portion 72. The projecting portion 74 is formed to extend from the inner end portion of the connecting portion 72 to the front side of the turbofan.
Also, the inner end of the Olipis 11 shown in FIG. 1 is inserted inside the protrusion 74, so that the wind pressure loss of the air flowing into the turbo fan when the turbo fan operates can be minimized.
[0080]
It should be noted that the connecting portion 72 of the shroud 70 can be connected over the entire tip of the blade 60 or can be connected to only a part of the tip of the blade 60.
[0081]
In the turbofan according to the third embodiment of the present invention, the outer diameter Db of the base plate 50 is formed to be the same as or smaller than the inner diameter Da of the shroud 70.
Therefore, it is of course possible to perform injection molding integrally.
That is, forming the outer diameter Db of the base plate 50 so as to have a dimension equal to or smaller than the inner diameter of the shroud 70 is a configuration for enabling the turbofan to be integrally injection-molded.
[0082]
If the base plate 50 and the shroud 70 have dimensions that overlap each other, the entire turbofan cannot be integrally injection-molded by a single mold as described above. .
[0083]
As described above, according to the third embodiment of the present invention, the widths (Wi, Wo) on the inlet side and the outlet side of the plurality of blades 60 arranged along one circumferential surface of the base plate 50 are the same. The basic point is to be composed.
[0084]
Therefore, according to the third embodiment of the present invention, the inlet side and the outlet side width of the blade 60 are configured to be the same, so that the air that has flowed into the turbofan flows from the inlet side to the outlet side of the blade 60. The flow area ratio when flowing is the same, and a uniform wind pressure is applied from the inlet to the outlet of the blade 60.
[0085]
The fact that the same wind pressure is applied from the inlet to the outlet of the rotating blade 60 means that the pressure balance is maintained from the inlet to the outlet of the blade 60, which maximizes the air flow noise. By being suppressed, a turbo fan that can be operated more silently can be provided.
[0086]
Further, if the outer diameter Db of the base plate 50 is set to be equal to or smaller than the inner diameter of the shroud 70, the entire turbofan can be formed by a single injection, and the turbofan, which is the main part of the air conditioner, can be more easily formed. There is an advantage that the rate can be minimized.
[0087]
In the third embodiment of the present invention, the mold can be easily manufactured, wear can be suppressed, and the mold can be improved in durability.
[0088]
A turbofan according to the fourth embodiment will be described with reference to FIG.
FIG. 13 is a cross-sectional view illustrating a turbofan structure according to a fourth embodiment of the present invention. In the third embodiment, the shape of the base plate 50a is modified, and other components are the same as those described above. This is the same as the third embodiment.
[0089]
The base plate 50a according to the present embodiment includes a hub 52 coupled to the rotation shaft of the motor at the center thereof. That is, the hub 52 is formed at the center of the base plate 50a in a state where the hub 52 protrudes in two steps toward the front side toward the shroud 70a.
[0090]
By configuring the base plate 50a according to the present embodiment so as to protrude in two steps toward the shroud 70a, the axial width between the turbofan and the motor can be reduced, and the peripheral components thereof can be reduced. There is an advantage in that the arrangement space can be secured more widely and the arrangement and design of peripheral elements can be more freely performed.
[0091]
In addition, the present embodiment also has an advantage that the mold can be easily manufactured, wear can be suppressed, and the durability of the mold can be improved.
[0092]
At the same time, in this embodiment, the hub 52 that maintains the balance of the weight center of the turbofan is positioned close to the center of the turbofan along the axial direction, so that the mold can be easily removed during molding, and the turbofan is driven. Vibration and noise due to eccentricity will be reduced.
[0093]
14a and 14b are cross-sectional views of blades applied to the embodiments of the present invention. The blades 40 and 60 of the turbofan according to the embodiments of the present invention are wired as shown in FIG. 14a. Molding can be performed so as to have a cross section of the mold, and molding having a simple flat cross section as shown in FIG. 14b is also possible.
[0094]
【The invention's effect】
As described above, the present invention has the following effects.
According to each embodiment of the present invention, the turbofan can be molded integrally, the mold for molding the turbofan can be easily manufactured, and the durability of the mold can be improved.
[0095]
According to the present invention, vibration and noise generated when the turbo fan is driven can be minimized.
[0096]
Further, according to each embodiment of the present invention, since the portion where the shroud and the base plate overlap each other is eliminated, the entire turbofan can be integrally formed by one injection molding.
[0097]
Therefore, since the defect rate that occurs during the molding of the turbofan can be minimized, the effect of improving productivity is expected.
[0098]
The preferred embodiment of the present invention has been described above, but various modifications or changes can be made based on the technical idea of the present invention.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a conventional window type air conditioner.
FIG. 2 is a perspective view showing a conventional turbofan applied to a window type air conditioner.
3A is a front view of FIG. 2. FIG.
3B is a cross-sectional view of FIG.
FIG. 4 is a cross-sectional view showing another embodiment of a conventional turbofan.
FIG. 5 is a cross-sectional view showing a state in which the turbo fan of FIG. 4 is molded in a mold.
6 is a longitudinal sectional view showing air flow when the turbo fan of FIG. 4 is applied.
FIG. 7 is a perspective view showing a turbofan according to the first embodiment of the present invention;
8 is a cross-sectional view of FIG.
9 is an enlarged view of the main part of FIG. 7,
FIG. 10 is a cross-sectional view showing air flow when a turbofan is applied according to the first embodiment of the present invention.
FIG. 11 is a cross-sectional view showing a turbofan structure according to a second embodiment of the present invention.
FIG. 12 is a cross-sectional view showing a turbofan structure according to a third embodiment of the present invention.
FIG. 13 is a cross-sectional view showing a turbofan structure according to a fourth embodiment of the present invention.
FIG. 14A is a cross-sectional view of a blade applied to each embodiment of the present invention.
FIG. 14B is a cross-sectional view of a blade applied to each embodiment of the present invention.
[Explanation of symbols]
30 Base plate
50 base plate
50a base plate
31 Base
32 hub
38 Through hole
40 blades
60 blades
50 shroud
70 shroud
70a shroud
52 End of suction side
54 Straight section
56 Inclined steps

Claims (4)

A base plate provided with a hub coupled to the rotation shaft of the drive motor at the center;
A plurality of blades arranged along the circumferential direction on the periphery of the base plate;
A suction side end coupled to an end of the blade and formed in a direction parallel to the rotation axis, the inner diameter of which is the same as or larger than the outer diameter of the base plate; and the suction side end A linear portion formed by linearly extending radially outward from the inner peripheral surface of the inner portion, and a shroud that is an inclined step portion that is obliquely extended in the centrifugal direction of the base plate at the end of the linear portion,
A turbo fan for an air conditioner characterized by comprising: The base plate is
A central portion in which a hub is formed, and a central portion formed in a cap shape so as to be positioned closer to the inlet side than the base portion on the outside thereof;
The center part and the base part in which the said hub was formed are connected, It has the connection part in which many through-holes are formed along the circumferential direction. Turbo fan for air conditioner.   The turbocharger for an air conditioner according to claim 2, wherein the connecting portion is parallel to a rotation axis direction, and a portion where the central portion where the hub is formed and the connecting portion is curved is curved. fan.   The turbo fan for an air conditioner according to claim 1, wherein the width of the straight portion of the shroud is at least 4 mm or more.

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